Q3 of 70 Page 21

Find the radius of a sphere whose surface area is 154 cm2.

Surface area of a sphere = 4πr2


Given, surface area is 154 cm2


⇒ 4 × (22/7) × r2 = 154


⇒ r2 = 49/4


⇒ r = 3.5 cm


More from this chapter

All 70 →
1

Find the surface area of a sphere of radius 14 cm.

 2

Find the total surface area of a hemisphere of radius 10 cm.

 4

The hollow sphere, in which the circus motor cyclist performs his stunts, has a diameter of 7 m. Find the area available to the motorcyclist for riding.

 5

Find the volume of a sphere whose surface area is 154 cm2.